SARPROZ ©

Hi Cecilia, in order to better understand the issue, could you please attach a picture of the Asc and Desc results (PS) you imported in the decomposition module?

Dear Leewoneung,

I am SARProZ team leader in Beijing and I think we have met begginning of this year for sw training.

Then I want to confirm your question. Do you want help to check the reason why you got uplifting value in your result, right?

From attaced screenshots I think the processing is not stable and reasonable but we need very detailed…[Read more]

I took two points spatially close (ca 200m distance). Because the area per se have not so many points.
Unfortunately, I do not know anyone close that can help me. I am doing this project basically from zero.
But ok thanks I will try to improve the resolution then

A first question would be: did you select points representative of the area where they are located or did you choose outliers?
Secondly, the software decomposes asce/desce velocities only on AD pairs. AD pairs are points located closely in A/D datasets. The sw selects them based on your inputs (AD processing) and based on the corrected shifts…[Read more]

sorry I forgot the image

Let’s see. In the figure attached , there is the East -West velocities from the module. Blue is positive so East. So far so good.
But I took one descending point which has final trend of -20mm/year (the “typical” value you get in the small area processing), and one ascending point value of -7mm/year. So both negative.
The points are located in a…[Read more]

Can you please post an example?

Yes in my case, if A is + and D is – then the resultant is negative (toward West). Yes I have no doubts about the sign per se, but about the fact that the software and my computation do not agree (on a determined location, software says + and my computation says -). Is this what I cannot figure out. I check the formulas many times and always got…[Read more]

Hi Cecilia,
to find out where is the sign problem, I’d suggest you to find a case where the Asce and Desce velocities have opposite sign.
Where A is + and D is -, the point must move to the W. If the plotted result is positive, it means that the E-W component was assumed positive to the W. If you can confirm it, we will change sign and change the…[Read more]

Hello,
so I used the software (multi sensor module) to do the combination of ascending and descending to get horizontal and vertical velocities. And, since I was interested to see the horizontal deformation along time, I took the values in the time series and I used the formula found in the paper “Space geodetic monitoring of engineered…[Read more]

Hi leewoneung,
I am sure that the guys in Beijing will be able to check the matter with you.
good work

oh sorry, I have some mistake that is my question.

First I had choosed spatial coherence > 0.7 and I completed a series of preliminary works.
And I choosed 1-Sigma/mu Index ,So I completed a series of PSInSAR works.

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First I had choosed 1-Sigma/mu Index > 0.7 and I completed a series of…[Read more]

Hello,

The coregistration accuracy is independent of footprint shift.

A simple-way-to-think for how-satellite-works is that it scans along a swath. The swath has a fixed “width” (but we call it range) but as you scan along you can have a long “length” (we call it azimuth).

For the purpose of distributing products to the public, one needs to…[Read more]

Hello,

when getting contents i get this warning:

WARNING: image centers shifted more than 10km!!!!

I attachements you will find the screenshot of the radar footprints. Area of interest is represented by the yellow pin. I´m using 79 Sentinel 1A images acquired from the same orbit number with descending track. 12 of these images are shifted…[Read more]

Hello Jaroslav,

If this error happens again, I have a temporary solution for you.

If you tick “Debug Message”, you will be able to see which date does this error occur exactly. Then you can manually download the orbital files for this date. The instruction could be found…[Read more]

Hello,
The problem has really gone by itself. Thank you for assistance.
If this kind of error happens again, do I just wait a couple of days for this error to be gone?

Jaroslav

Hello Jaroslav,

This looks like an orbital file downloading failure to me. I believe that clicking on “Set Orbits” again should have your issue resolved by now. Could you please try that?

yuxiao

Sorry for late response.
The of the file, i have found there: S1B_OPER_AUX_RESORB_OPOD_20171001T085309_V20171001T040012_20171001T071742.EOF

Jaroslav